standard specification for erection tender - GAIL

These drawings represent the nozzle elevation, nozzle sizes and rating, requirement of standpipes,
type of level instrument etc. for all the vessels, columns, exchangers and tanks.
1.4.3.8 Purchase Requisition (PR)
Purchase Requisition contains all information, which form part of material requisition but
updated in line with the finally accepted offer of the successful bidder. Typically purchase
requisition shall contain
a) Instrumentation specification, detailed instrument data sheets
b) Standard specification, quality assurance requirements
c) Testing ( shop and field ), inspection and shipping requirements
d) Drawing document requirement
e) Training requirements, if applicable
f) Make and Model number of selected vendor.
1.4.3.9 Functional Schematics (FS)
Functional Schematics details out the functionality of all the loops shown on the P&ID
including their correlation. The schematic shows all the hardware necessary to configure a
loop including their physical location, their interconnection and important software blocks as
applicable to make a loop complete. Similar loops may be combined under the same
functional schematic.
1.4.3.10 Logic Diagrams
Logic diagram is a logic representation of process interlock and shutdown system and details
out the functionality, in a schematic form, based on either process cause and effect table
shown on the P&ID or in a separate write-up. The schematic shall be prepared based on ISA
S5.2 - ˜Binary Logic Diagrams for Process Operations˜ and shall show the physical location
of Input/Output devices, their interconnection with functional blocks, bench status of all
electrical devices etc. The schematic shall also be supplemented with operational requirements
like startup and process bypasses, reset and shut down push buttons, selector switches, status
lamp etc.
1.4.3.11 Instrument Loop drawings
Each loop shall have a separate Instrument Loop drawing which shall show each component
from field device to final receiver including physical location, initiating device, its terminal
number, junction box with its terminal number, cable number with pair number/polarity,
receiver instrument terminals/cabinet terminals, system functional blocks of loop in simplified
manner (without configuration details).
1.4.3.12 Control Room Layout
Control room layout drawing shall show the location of control panels, system cabinets,
marshalling racks and other auxiliary cabinets, consoles with monitors, hard wired consoles,
printers, non-system panels/cabinets including panels/cabinets for packages, LEL panel, fire
alarms panels or any other equipment required to be installed in control room. The layout
shall be prepared on control room architectural drawing and shall also show layout of
STANDARD SPECIFICATION FOR
SPECIFICATION REV-0
GAIL (INDIA) LTD INSTRUMENTATION WORKS
Page 8 of
NEW DELHI
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